<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll" />
    <label for="toggle-all"></label>
    <!-- 输入框 -->
    <!-- ***输入框内容用修饰符去掉首尾空格 -->
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="content"
      @keyup.enter="add"
    />
  </header>
</template>

<script>
export default {
  props: {
    arr: {
      type: Array,
      require: true,
    },
  },
  data() {
    return {
      content: "",
    };
  },
  methods: {
    add() {
      // !输入空内容return
      if (this.content.length === 0) {
        return;
      }
      this.$emit("add", this.content);
      // 触发完事件之后清空
      this.content = "";
    },
  },
  computed: {
    isAll: {
      get() {
        return this.arr.length !== 0 && this.arr.every((item) => item.isDone);
      },
      set(val) {
        this.arr.forEach((item) => (item.isDone = val));
      },
    },
  },
};
</script>
